Brake-operating mechanism



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E. G. MCDONALD .BRAKE OPERATING MECHANI-SM Filed Feb. 25. 1926 ATTORNEYthe center of ball 38 is ari-an ed when the;

y. brake is ap liedY a few hun redths of an inch from t e swivellingaxis, on the slde corresponding to lever 36, extends outwardly lball 48on a lever 50 which is arranged,

' which is preferred if a very considerablel for the brake-a plyingdevice mounte device -for movement a instead of inwardly, and is engagedby a when the brake is applied, substantially at the crossin of theswivelling axis and the axis of pivot 30. In this arrangement,

movement of support 28v is anticipated, the shifting of 'the supportdoes not alect the angular position o the sup rt, and therefore does notaffect the br' e.l Ordinarily the shiftin of the supportds'at mosta fewhundredt s of an inch, and the arrangement of Figs. 1 and 2' isventirely satisfactory.

vVlhile twol illustrative embodiments have been described in detail, itis not my intention to limit its'scope to those particular embodiments,or otherwise than by the terms of the appended claimsc/' I claim: 1. A.brake comprising, in combination, a drum, friction means withinxthedrum having adjacent separable' ends, a brake-applying device engagingsaid ends, anda sucpppt o side the circum erence of the drum andpermitting the device to shift when the brake is applied to balance thepressures "on said ends. 2. A brake comprising, in combination, a drum,frictiommcans within the drum having adjacent separable ends, abrake-applying. device engaging'said ends, and means for pivotallysupportin the brake-applying ut an axis outside the circumference of thedrum.

3. A brake com rising, 4in combination, a drum, a backing p ate having apart outside Mthe circumference of the drum, friction.

means within the drum, and an appl 'ng de-` n vice for the frictionmeans pivota ly supseparable ends, a cam acting on sai ported on saidpart of the backin plate outside the circlimference of the bra e drum.

4. A brake com rising, in combination, a drum, a backing p ate having apart outside the circumference of thc drum, ,friction means lWithin thedrum having adjacent separable ends, an applyn devicey acting on saidends, andI a su port or the a p1 ing device pivoted onsaid part of thehac ing plate outside the circumference of the brake drum. j 5. Av brakecom rising, in combination, a drum, abackingl p 'ate having a partoutside 'the circumference of the drum, i friction means within .thedrum having djacent (ll ends, a horizontal shaft for the cam, andasuport in which the shaft :is journalled pivote yon drum, a backing platelever 46 with .respect to said part of the backing plate outside thecircumference of the brake drum. 6. A brake comprising, inl combination,a drum, friction means within the drum having 'adjacent separable ends,acam acting on said ends, a horizontal shaft for the cam, and a supportin which the shaft is jour nailed pivotally mounted for movement aboutan axis outside the circumference of the brake drum.

7. A brake comprisinfr, in combination, a ior the open side of the drumhaving a flange encircling the edge i of the drum: and having a suporting part extending radially outward eyond the ange,yfriction meansengageable with' the drum, and an applying device for the `frictionmeans supported `on saidpart of the backing platev beyond-the ilange'.A8. A brake backing Slate having an edge flange to encircle the e ge of abrake drum and a supporting part integral withl sai gangs an extendingradially outward thererom. I

9. A brake backing flange to encircle the e slate having an edge ge cfabrake drum,

and a su porting part integral with said flange an extending 'radiallyoutward therefron'z and oiset back substantially in'to the plane' of thecentral portion of the backing p ate.

1 0. Operatin mechanism for a brake on a swlvelled whee including adrum2 compris'- ing, in combination, a brake-applying devicecircumference of .and above the brake drum 11o substantially in atransverse vertical plane` including the swivelling axis of the wheel,

and operating means for saidf-devicefincludy i ing parts movable withrespect to each other.y

when the brake is a plied out a center substantially in said p ane. i fH l2. O erating mechanism for abrake on a swivel ed Wheel including adrum, compris-v` ing, in combination', a brake-applyingdeviceautomatically shiftable to balance'itself, a '120 support for saiddevice pivoted outside they circumference of and-above. the brake drumsubstantially in a transverse vertical plane including the swivellingaxis of the.v Wheel,"v and operating means for said device includ- 125mg parts movable with res ectto each other when the brake is applicabout a center substantiallyin said Swivelling axis.. l. Operatingmechanism for a brake on a swivelled wheel including a druin, compris-13 ing, in combination, a support pivoted outside the circumference ofthe brake drum and extending within said circumference, brake-a plyingmeans carried by the support and inc uding parts within the drum, and alever operating said means and fulcrummed on the opposite side of theswivel'ling axls from the wheel and having its outer end movablecrosswise of the swivelling axis to a position substantially in saidaxis and havlng its inner end spaced a considerable distance vinwardlyfrom said axis.

14. Operating mechanism for a brake on a swivelled'qvvheel including adrum, comprising, in ,ombinatiom a support pivoted outsidethecircumference of the brake drum and extending within sai-dcircumference,l

brake-applying means carried by the support and including parts jwithinthe drum and a vetrical operating arm, and a lever enoaging said armwith its outer end and' fu crummed on the opposite side of theswivelling axis from the Wheel and having its outer end movable in adirection crosswise of the` swivelling axis and having its inner endspaced a considerable distance inwardly from 'said axis. I

'15. Operating mechanism for a brake on -a swivelled Wheel including adrum,com

brake-applying prising, in combination, means pivotally supported. for.movement about an axis outside the circumference of the drum andcrossing the sivivelling-axis of the wheel, and operating connectionsfor said means including' parts relatively movable with respect to eachother labout a center substantially at the crossing of' said tvoaxes.

16. O, erating mechanism for a brake on a swive led wheel includingadrum,l comprising, in combination, brake-applying means pivotallysupported tor movement about aan axis outside the circumference of thedrum and crossing the Swivelling axis of the Wheel, and operatingconnections for said means including a pair of interengagingleversrelativcly movable with respect to each )ther about a centersubstantially at the cross? ing of said two axes at least when the brak.is applied. 5o

17. Operating mechanism for a brake on a swivelled wheel includingadrum, comprising,. in combination, brake-applying means pivotallysupported for movement about an axis outside the circumference of thedrum and crossing the swivelling axis of the wheel, and operatingconnections for said means including a pair of interengaging leversrelatively movable with respect to each other about "a centersubstantially at the tially at the crossing of the two axes,

yother when the vbrake is applied about a center substantially at thecrossing of the' .two axes.

19. Operating mechanism for a brake on a swivelled wheel comprising, incombination, pivotallysupported brake-applying means mounted to swingabout an axis above said means and crossing the swivelling axis of thewheel, and operating connections for said means including a. pair ofinterengaging levers \relatively movable with respect to each other whenthe brake is applied about af center substantially at the crossing ofthe two axes, the interengagin parts of the levers beingA movable in appying the brake in a direction generally perpendicular to' both axes.

20. Operating mechanism for a brake 0n a, sivivelled wheel comprising,in combination, pivotally-supported brake-applying means mounted toswing about an axis above said means and crossing the sivivell" g axisof the Wheel, and'operating connections for sa'id means including a pairof interengaging levers one of which hasa ball at its end 'engaging theother, the center of the ball being arranged when the brake is appliedsubstan 21. Operating mechanism for a brake on a swivelled'wheelcomprising, in combination, pivotally-supported brake-applying meansmounted to swing about an axis above said means and crossing theswivelling axis of the wheeh, and operating connections for saidl meansincluding a! pair of interengaging levers one of which has a ball at itsend en-' gaging the other, the center of the ball being arranged whenthe brake is applied subst antially at the crossing of .the two axes,said ball, being movable in applying the brake in a directionsubstantially perpendicular to both axes y In testimony whereof, `Ihavey hereunto U5 signed my name.

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